SetupDialog: Warn of unusual buffersizes

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This displays a warning dialog if the users requests unusual
buffersizes:

- buffersizes less than 32
- buffersizes which are not a (natural number) power of 2

This commit also replaces some `setGeometry` stuff by `QBoxLayout`.

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500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f